Resin-coated carrier for electrophotographic developer and process for producing the same, and electrophotographic developer comprising the resin-coated carrier
US8092971B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 2004 |
| Grant date | Jan 10, 2012 |
| Priority date | — |
| Expiry date | Feb 17, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1085
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An object of the present invention is to provide a resin-coated ferrite carrier comprising a carrier core material having a small particle size, a high sphericity and surface uniformity, and a low standard deviation, a process for producing the carrier, and an electrophotographic developer comprising the resin-coated ferrite carrier and having a high image quality and excellent durability. For achieving the above object, there is provided a resin-coated carrier for an electrophotographic developer characterized by comprising spherical ferrite particles having an average particle size of 20 to 50 μm, a surface uniformity of 90% or more, an average sphericity of 1 to 1.3 and a sphericity standard deviation of 0.15 or less, a process for producing the carrier, and an electrophotographic developer comprising the resin-coated carrier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.